Link determining method, apparatus, and system for optical packet switching system

Abstract

Embodiments of the present invention relate to the field of information technologies and disclose a link determining method, apparatus, and system for an optical packet switching system, which can reduce optical packet switching costs. The method includes: first, a control manager generates reference optical label information and an enabling signal, and sends the reference optical label information and the enabling signal to a link determining device; then, when the enabling signal is active, the link determining device determines, according to parsed-out actual optical label information and the received reference optical label information, whether an alarm signal is generated, and if it is determined that the alarm signal is generated, sends the alarm signal to the control manager; and finally, the control manager further determines, according to the received alarm signal, whether a link corresponding to the alarm signal is abnormal.

What is claimed is: 
     
       1. A link determining method for an optical packet switching system, comprising:
 parsing out, by a control manager, routing information carried in an optical label of an optical packet before switching; 
 generating, by the control manager, reference optical label information and an enabling signal according to the routing information; 
 sending, by the control manager, the reference optical label information and the enabling signal to a link determining device; 
 determining, by the control manager when the enabling signal is active, whether an alarm signal sent by the link determining device is received; and 
 determining, by the control manager according to the alarm signal if the alarm signal sent by the link determining device is received, whether a link corresponding to the alarm signal is abnormal. 
 
     
     
       2. The link determining method for an optical packet switching system according to  claim 1 , wherein the reference optical label information is at least one type of information comprised in various information types of the routing information; and
 the various information types of the routing information comprise source port information, destination port information, packet length information, or priority information. 
 
     
     
       3. The link determining method for an optical packet switching system according to  claim 1 , wherein the enabling signal is used to trigger the link determining device to detect whether a link is abnormal. 
     
     
       4. The link determining method for an optical packet switching system according to  claim 1 , wherein before the step of determining, by the control manager according to the alarm signal, whether a link corresponding to the alarm signal is abnormal, the method further comprises:
 if the alarm signal sent by the link determining device is received, increasing, by the control manager, a quantity of link alarm times by one; and determining, by the control manager, whether the quantity of link alarm times that is increased by one is greater than a preset threshold; and 
 the step of determining, by the control manager according to the alarm signal, whether a link corresponding to the alarm signal is abnormal comprises: 
 if the quantity of link alarm times that is increased by one is greater than the preset threshold, determining, by the control manager, that the link is abnormal. 
 
     
     
       5. The link determining method for an optical packet switching system according to  claim 4 , wherein after the step of determining, by the control manager, that the link is abnormal, the method further comprises:
 updating, by the control manager, link status information in a link status information table from normal to abnormal. 
 
     
     
       6. The link determining method for an optical packet switching system according to  claim 1 , wherein before the step of generating, by the control manager, reference optical label information and an enabling signal according to the routing information, the method further comprises:
 determining, by the control manager, enabling signal activation duration according to the packet length information, wherein the enabling signal activation duration is used to determine a time at which the enabling signal is deactivated; and 
 after the step of determining, by the control manager when the enabling signal is active, whether an alarm signal sent by the link determining device is received, the method further comprises: 
 performing, by the control manager, a zero assignment operation on the quantity of link alarm times when the enabling signal is inactive and if the alarm signal sent by the link determining device is not received. 
 
     
     
       7. The link determining method for an optical packet switching system according to  claim 1 , wherein the link is a link in a primary optical packet switch or a link in a secondary optical packet switch;
 the step of determining, by the control manager according to the alarm signal if the alarm signal sent by the link determining device is received, whether a link corresponding to the alarm signal is abnormal comprises: if an alarm signal that corresponds to the link in the primary optical packet switch and that is sent by the link determining device is received, determining, by the control manager according to the alarm signal that corresponds to the link in the primary optical packet switch, whether the link in the primary optical packet switch is abnormal; and after the step of determining whether the link in the primary optical packet switch is abnormal, the method further comprises: if it is determined that the link in the primary optical packet switch is abnormal, sending, by the control manager, a primary/secondary selection control signal to an optical packet switch, so that the secondary optical packet switch performs optical packet switching; or 
 if an alarm signal that corresponds to the link in the secondary optical packet switch and that is sent by the link determining device is received, determining, by the control manager according to the alarm signal that corresponds to the link in the secondary optical packet switch, whether the link in the secondary optical packet switch is abnormal. 
 
     
     
       8. The link determining method for an optical packet switching system according to  claim 7 , wherein after the step of determining whether the link in the primary optical packet switch is abnormal, the method further comprises:
 if it is determined that the link in the primary optical packet switch is abnormal, updating, by the control manager, link status information in the link status information table from normal to that the primary optical packet switch is abnormal; or 
 after the step of determining, by the control manager, whether the link in the secondary optical packet switch is abnormal, the method further comprises: 
 if it is determined that the link in the secondary optical packet switch is abnormal, updating, by the control manager, link status information in the link status information table from that the primary optical packet switch is abnormal to that the secondary optical packet switch is abnormal. 
 
     
     
       9. The link determining method for an optical packet switching system according to  claim 1 , wherein after the step of generating, by the control manager, reference optical label information and an enabling signal according to the routing information, the method further comprises:
 generating, by the control manager, a selection control signal according to the routing information, and sending the selection control signal to the link determining device, wherein the selection control signal carries identification information corresponding to an output port of the optical packet after switching. 
 
     
     
       10. A link determining method for an optical packet switching system, comprising:
 receiving, by a link determining device, reference optical label information and an enabling signal that are sent by a control manager; 
 parsing out, by the link determining device according to an information type of the reference optical label information, actual optical label information carried in an optical label of an optical packet after switching; 
 when the enabling signal is active, determining, by the link determining device according to the actual optical label information and the reference optical label information, whether an alarm signal is generated; and 
 when it is determined that the alarm signal is generated, sending, by the link determining device, the alarm signal to the control manager. 
 
     
     
       11. The link determining method for an optical packet switching system according to  claim 10 , wherein an information type of the actual optical label information is the same as that of the reference optical label information. 
     
     
       12. The link determining method for an optical packet switching system according to  claim 10 , wherein the information type comprises source port information, destination port information, packet length information, or priority information; and
 the reference optical label information is at least one information type comprised in the information type. 
 
     
     
       13. The link determining method for an optical packet switching system according to  claim 10 , wherein before the step of determining, by the link determining device according to the actual optical label information and the reference optical label information, whether an alarm signal is generated, the method further comprises:
 calculating, by the link determining device, a mismatch degree between the actual optical label information and the reference optical label information; and 
 the step of determining, by the link determining device according to the actual optical label information and the reference optical label information, whether an alarm signal is generated comprises: 
 determining, by the link determining device according to the mismatch degree between the actual optical label information and the reference optical label information, whether the alarm signal is generated. 
 
     
     
       14. The link determining method for an optical packet switching system according to  claim 13 , wherein the step of determining, by the link determining device according to the mismatch degree between the actual optical label information and the reference optical label information, whether the alarm signal is generated comprises:
 if the mismatch degree between the actual optical label information and the reference optical label information is greater than a preset threshold, determining, by the link determining device, that the alarm signal is generated; or 
 if the mismatch degree between the actual optical label information and the reference optical label information is less than or equal to the preset threshold, determining, by the link determining device, that the alarm signal is not generated. 
 
     
     
       15. The link determining method for an optical packet switching system according to  claim 10 , wherein before the step of parsing out, by the link determining device according to an information type of the reference optical label information, actual optical label information carried in an optical label of an optical packet after switching, the method further comprises:
 receiving, by the link determining device, a selection control signal sent by the control manager, wherein the selection control signal carries identification information corresponding to an output port of the optical packet after switching; and selecting, by the link determining device, the output port of the optical packet after switching from multiple output ports according to the identification information corresponding to the output port of the optical packet after switching; and 
 the step of parsing out, by the link determining device according to an information type of the reference optical label information, actual optical label information carried in an optical label of an optical packet after switching comprises: 
 parsing out, by the link determining device according to the reference optical label information and at the output port of the optical packet after switching, the actual optical label information carried in the optical label of the optical packet after switching. 
 
     
     
       16. The link determining method for an optical packet switching system according to  claim 10 , wherein the optical packet after switching is an optical packet after switching by a primary optical packet switch or an optical packet after switching by a secondary optical packet switch;
 the step of parsing out, by the link determining device according to the reference optical label information, actual optical label information carried in an optical label of an optical packet after switching comprises: 
 parsing out, by the link determining device according to the reference optical label information, actual optical label information carried in an optical label of the optical packet after switching by the primary optical packet switch; and 
 the step of determining, by the link determining device according to the actual optical label information and the reference optical label information, whether an alarm signal is generated comprises: 
 determining, by the link determining device according to the actual optical label information carried in the optical label of the optical packet after switching by the primary optical packet switch and the reference optical label information, whether an alarm signal corresponding to a link in the primary optical packet switch is generated. 
 
     
     
       17. The link determining method for an optical packet switching system according to  claim 16 , wherein the step of parsing out, by the link determining device according to the reference optical label information, actual optical label information carried in an optical label of an optical packet after switching comprises:
 parsing out, by the link determining device according to the reference optical label information, actual optical label information carried in an optical label of the optical packet after switching by the secondary optical packet switch; and 
 the step of determining, by the link determining device according to the actual optical label information and the reference optical label information, whether an alarm signal is generated comprises: 
 determining, by the link determining device according to the actual optical label information carried in the optical label of the optical packet after switching by the secondary optical packet switch and the reference optical label information, whether an alarm signal corresponding to a link in the secondary optical packet switch is generated. 
 
     
     
       18. The link determining method for an optical packet switching system according to  claim 17 , wherein after the step of determining, by the link determining device according to the actual optical label information carried in the optical label of the optical packet after switching by the primary optical packet switch and the reference optical label information, whether an alarm signal corresponding to a link in the primary optical packet switch is generated, the method further comprises:
 when it is determined that the alarm signal corresponding to the link in the primary optical packet switch is generated, sending, by the link determining device, the alarm signal corresponding to the link in the primary optical packet switch to the control manager; or 
 after the step of determining, by the link determining device according to the actual optical label information carried in the optical label of the optical packet after switching by the secondary optical packet switch and the reference optical label information, whether an alarm signal corresponding to a link in the secondary optical packet switch is generated, the method further comprises: 
 when it is determined that the alarm signal corresponding to the link in the secondary optical packet switch is generated, sending, by the link determining device, the alarm signal corresponding to the link in the secondary optical packet switch to the control manager. 
 
     
     
       19. The link determining method for an optical packet switching system according to  claim 10 , wherein after the step of parsing out, by the link determining device according to the reference optical label information, actual optical label information carried in an optical label of an optical packet after switching, the method further comprises:
 when the enabling signal is inactive, if the actual optical label information carried in the optical label of the optical packet after switching cannot be parsed out, determining, by the link determining device, that the alarm signal is generated. 
 
     
     
       20. A link determining system for an optical packet switching system, comprising a control manager and a link determining device, wherein
 the control manager is configured to parse out routing information carried in an optical label of an optical packet before switching, and generate reference optical label information and an enabling signal according to the routing information; 
 the control manager is further configured to send the reference optical label information and the enabling signal to the link determining device; 
 the link determining device is configured to receive the reference optical label information and the enabling signal that are sent by the control manager, and parse out, according to an information type of the reference optical label information, actual optical label information carried in an optical label of the optical packet after switching; 
 the link determining device is further configured to: when the enabling signal is active, determine, according to the actual optical label information and the reference optical label information, whether an alarm signal is generated, and when it is determined that the alarm signal is generated, send the alarm signal to the control manager; and 
 the control manager is further configured to: when the enabling signal is active, determine whether the alarm signal sent by the link determining device is received, and if the alarm signal sent by the link determining device is received, determine, according to the alarm signal, whether a link corresponding to the alarm signal is abnormal.